Thread-measuring device for leather-stitching machines



C1. M. WHUFY. y THREAD IVIEASUHING DE'VICE FUR LEATHER SITCHING MACHINES. vAPPLICATION msu mm. 16. 192g. y

mmm.

`cIIAELEs `E] MILLEa* on cHIcAeo, ILLINOIS, AssIeNoE, BY DIRECT AND I/IEsNE ASSIGNMENTS, YrocIIIcAefo srroE MACIIINEIWl coI/IrAN-Y, or cIIIcAeo, ILLI- NoIs, A CORPORATION or ILLINOIS. i i

`einemfaliiieasveinelrcEvIeE son LEArHEa-.srrmcmive iviAcrIINEs. i

4emilieami; sie@ Marci; 1e, i921. sriai No. 452,675.

"o all fw kom t may concern. .j

it known that IQCI-IARLESVF, Minnen, a citizen ofthe United States, and'resding at Chicago, in the county of Cook andy State of lllineis, have invented certainnew and 'useful Improvements in Thread-Measuring .lDevices for Leather-Stitching Machines, of `which the following is a specification. e

rlhis invention relates to Anew-,and useful improvements in threadmeasuring devices` for leather stitching machines. l e The'principal object ofthis invention is to provide a thread measuring device which oscillates about a vertical airis and co-,operates with a thread-thrower to measure a .lxed amount of thread foreach stitch.

Another object of the invention is to provideameasuring device of the character described which includes a thread-engaging finger carried by a vertical supporting shaft, and off-set from the aXis thereof, so as to be cscillated in a horizontal planeto first engage and retaina loop of thread while the thread-thrower carries one strand of said loop into a position to be engaged by the hook of a 'co-operating needle, and to subsequently release said loop of thread during the 11p-stroke of the needle.

ln the drawings,

Figure 1 is a front elevation showing the stitch-forming mechanism of a leather' stitching machine and including my improved thread-measuring device,

Figure 2 is a sectional view thereof, showing the actuating mechanism for said threadmeasuring device, and i Figure 3 is a detail view showing the positions of the parts at the time the needle begins to elevate the thread.

Like reference numerals designate corresponding` parts in all the figures of the drawings.

Referring to t-he drawings, 5 designates the frame 0f the sewing machine, and 6 the work support, which is carried thereby, and formed with a feeding slot 7, in which the awl (not shown)` moves to feed the work. The stitch-'forming mechanism includes a. vertically reciprocating hooked needle 8, a thread-thrower 9, and a thread-measuring `device 10. The needle oscillates in a vertical path from a point above the work to a point below the work support. The threadthrower 9 and the thread-measuring device l() are movably supported belowthe work support and co-operate withl oneanother and with," the needle. l

The thread-.thiowerf9 includes an arm 1v1 having a thread guide 12 formed at its upper end. v`'llhs 4army extends in`` al substantially verticalplane, butis off-set from the vertical shaft 1'1",.tc which it is connected. Fixedto the shaft 11a is a block 13 which rides b etween inclined tracks 141-.-1/1: `The shaft 11a. is suitably journaled in a bracket 15,` and fixed to the lower end of said shaft is ari` arm 16, which actuated from a link 17 by a cam mechanism not shown, It will thus be seen that as the shaft 11.* is cscillated, the` thread guide 12 will be oscillated frein right toleft, and vice versa, in an inclined path, the movement from left to right being upwardly inclined.

Co-operating with the thread-thi'ower 9 is the thread measuring device 10. This thread-measuring device comprises an. arm 18, which is carried by a shaft 19, the shaft 19 being disposed in a vertical plane and suitably journaled in the bracket 15. rlfhe arm 18 is off-set from the axis of the shaft 19 and is provided at its upper end with a laterally extendin thread-engaging nger 2 0. Fixed to t e shaft 19 is a rockarm 21 which is pivotally connected, as at 22, to one end of a link 23. The other end of the link 23 is pivotally connected, as at 2li, to a roller-lever 25, which is pivoted at its lower end, as at 26, to the frame 5 of the machine. n gaging roller 27 journaled thereon, and this roller normally engages the periphery 28 of a cam disk 29, which carries on its periphery an outwardly extending cam 30; A spring 31 has one end bearing against the frame 5 and the other end against the upper end of the roller-carrying lever 25, so as to yieldingly retain said roller in engagement with the periphery 28 or the cam 30 of the cam disk `29.

llVhen the shaft 19 is oscillated the threadengaging finger will be oscillated in a horizontal plane above the thread-guide12 of the thread-thrower 9.

Assuming the parts to be in the positions shown in. Figure 1, the shaft 19 is oscillated so that the finger 2O will be moved The lever 25 has a cam-ento the left for engagement with the loop of loop of thread, the thread-thrower l9 will be moved upwardly to the right whereby the thread will be positioned to be engaged by the hook of the needle 8 when the latter rises. It will, therefore, be seen that the.

thread finger 2O measures a predetermined amount of thread for each stitch. The shaft 19 is thenreturnedto its normal position, as shown in Figure 1 of the drawings.

What I claim is:

l. In a leather stitching machine, the combination With a work support, of a hooked needle reciprocating in a vertical plane from a point above the work support, a thread thrower disposed below the work support and movable upwardly in an inclined plane upwardly from left to right to position the thread for engagement by the hook of the needle, and a thread-measuring finger oscillating in a horizontal plane below the work support andvabove the thread thrower and co-operating therewith to measure a fixed amount of thread for each stitch.

2. In a leather stitching machine, the combination with a work support, of a hooked needle reciprocating in a vertical plane from a point above the work support, a threadvthrower disposed below the worksupport an-d movable upwardly in an inclined plane to position the thread for engagement by the hook of the needle, a vertical shaft, an olf-set thread-engaging {inger carried by the upper end of the shaft, and means for oscillating said shaft whereby said finger will cooperate with said thread thrower to measure a fixed amount of thread for each stitch.

3. In a leather stitching machine, a threa-d measuring device comprising in com bination, a vertical shaft an arm lixed to the upper end thereof and disposed in a vertical plane offset from the axis of said shaft, a laterally extending thread-engaging linger carried by the upper end of said arm, and means for oscillating said shaft, comprising a cam, a 'rock-arm fixed to said shaft, a lever, a roller carried by said lever, a spring engaging the lever to yieldably retain the roler in engagement with the cam, and a link connecting said rock-arm and said lever.

CHARLES F. MILLIil. 

